multi: add new AuxChanCloser to allow adding additional outputs to co-op close transaction

[Roasbeef]

In this PR, we add a new interface, the AuxChanCloser. This interfaces allows a caller wrapping lnd in another Go program (not exposed over RPC for now) to add additional outputs to a co-op close transaction, and also modify the way sorting happens with the co-op close transaction.

We handle the extra close outputs by deducting the value of a party's output from their normal settled output. If after that deduction, their output is dust, then we'll just swap out the old delivery addr script with this new addr. If a party doesn't have an output on the coop close transaction, then they can't add a new output.

Along the way, I've re-introduced a result type (Result[T]) as it makes it easier to write idiomatic Go code when using option return values. It also makes a limited version of Railway Oriented Programming possible.

Note to reviewers: I added some commits in the tlv package that seemed to be missing from the current integration branch.

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